Untwisting and Disintegration of a Solar Filament Associated with Photospheric Flux Cancellation
文献类型：期刊论文
| 作者 | Chen,Huadong1,2 ; Zheng,Ruisheng3; Li,Leping1,2; Ma,Suli1,4; Bi,Yi1,5; Yang,Shuhong1,2
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2019-02-04 |
| 卷号 | 871期号:2 |
| 关键词 | Sun: activity Sun: filaments, prominences Sun: photosphere Sun: UV radiation |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aafa83 |
| 英文摘要 | Abstract Using the high-resolution observations from the New Vacuum Solar Telescope (NVST) jointly with the Solar?Dynamics?Observatory data, we investigate two successive confined eruptions (Erup1 and Erup2) of a small filament in a decaying active region on 2017 November 10. During the process of Erup1, the overlying magnetic arcade is observed to inflate with the rising filament at the beginning and then stop during the explosion. In the hot EUV channel, a coronal sigmoidal structure appears during the first eruption and fades away after the second one. The untwisting rotation and disintegration of the filament in Erup2 are clearly revealed by the NVST Hα intensity data, hinting at a pre-existing twisted configuration for the filament. By tracking two rotating features in the filament, the average rotational angular velocity of the unwinding filament is found to be ～10.°5 min?1. A total twist of ～1.3π is estimated to be stored in the filament before the eruption, which is far below the criteria for kink instability. Several hours prior to the event, some photospheric flux activities, including the flux convergence and cancellation, are detected around the northern end of the filament, where some small-scale EUV brightenings are also captured. Moreover, strongly sheared transverse fields are found in the canceling magnetic features from the vector magnetograms. Our observational results support the flux cancellation model, in which the interaction between the converging and sheared opposite-polarity fluxes destabilizes the filament and triggers the ensuing ejection. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-871-2-AAFA83 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/24948]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China; hdchen@nao.cas.cn 2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 3.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, and Institute of Space Sciences, Shandong University, Weihai 264209, People’s Republic of China 4.College of Science, China University of Petroleum, Qingdao 266580, People’s Republic of China 5.Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming 650011, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Chen,Huadong,Zheng,Ruisheng,Li,Leping,et al. Untwisting and Disintegration of a Solar Filament Associated with Photospheric Flux Cancellation[J]. The Astrophysical Journal,2019,871(2). |
| APA | Chen,Huadong,Zheng,Ruisheng,Li,Leping,Ma,Suli,Bi,Yi,&Yang,Shuhong.(2019).Untwisting and Disintegration of a Solar Filament Associated with Photospheric Flux Cancellation.The Astrophysical Journal,871(2). |
| MLA | Chen,Huadong,et al."Untwisting and Disintegration of a Solar Filament Associated with Photospheric Flux Cancellation".The Astrophysical Journal 871.2(2019). |
入库方式： OAI收割
来源：国家天文台
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